Coil unit

a coil base and coil technology, applied in the direction of transformer/inductance details, inductance, electrical equipment, etc., can solve the problems of large amount of ferrite, high manufacturing cost, and inability to form large-sized coil bases, so as to reduce manufacturing costs

Active Publication Date: 2018-12-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent aims to reduce manufacturing costs by using identical ferrites to create a coil base. The technical effect is lower manufacturing costs for coil units.

Problems solved by technology

Therefore, a necessary amount of ferrite is large and manufacturing cost is high.
The coil base above, however, suffers from a disadvantage that a large-sized coil base cannot be formed.
In firing, a temperature distribution tends to be uneven and a fracture or a crack tends to be produced.
Therefore, it is currently difficult to manufacture a large divided ferrite.
Therefore, it has been found that the coil base studied by the inventors suffers from such a problem that only a small-sized coil base can be formed.

Method used

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Embodiment Construction

[0042]FIG. 1 is a diagram schematically showing a contactless charging system 1 and FIG. 2 is a circuit diagram schematically showing contactless charging system 1. As shown in FIGS. 1 and 2, contactless charging system 1 includes an electric power reception unit 4 mounted on a vehicle 2 and an electric power transmission apparatus 3 transmitting electric power to electric power reception unit 4 in a contactless manner.

[0043]Electric power reception unit 4 includes an electric power reception apparatus 5 which receives electric power transmitted from electric power transmission apparatus 3, a rectifier 6 which converts AC power received by electric power reception apparatus 5 into DC power and regulates a voltage, and a battery 7 which stores DC power supplied from rectifier 6.

[0044]Electric power stored in battery 7 is supplied to a not-shown drive motor which drives wheels.

[0045]Electric power reception apparatus 5 includes an electric power reception coil 8 and a capacitor 9 conn...

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Abstract

A coil unit includes a ferrite including a coil base in a form of a frame, on which a coil is arranged, and formed from a plurality of divided ferrites. The plurality of divided ferrites include a first divided ferrite and a second divided ferrite which form a corner piece and a third divided ferrite and a fourth divided ferrite which form a side piece.

Description

[0001]This nonprovisional application is based on Japanese Patent Application No. 2015-157197 filed with the Japan Patent Office on Aug. 7, 2015, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The present invention relates to a coil unit including a coil and a ferrite having the coil arranged.[0004]Description of the Background Art[0005]Various contactless charging systems for transmitting electric power from an electric power transmission apparatus to an electric power reception apparatus in a contactless manner have conventionally been proposed (Japanese Patent Laying-Open No. 2013-154815, Japanese Patent Laying-Open No. 2013-146154, Japanese Patent Laying-Open No. 2013-146148, Japanese Patent Laying-Open No. 2013-110822, and Japanese Patent Laying-Open No. 2013-126327).[0006]Japanese Patent Laying-Open No. 2008-120239 describes a coil unit including a coil and an E-shaped core. The E-shaped core is fo...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H01F27/24H01F3/10H01F38/14H01F3/12
CPCH01F27/24H01F38/14H01F3/12H01F3/10H01F27/306H01F2038/143
InventorYUASA, HIROAKIEJIMA, SHUHEI
OwnerTOYOTA JIDOSHA KK